<script>     
    // 代码1：不完全解构   
        let [x, y] = [1, 2, 3];   
        console.log(x, y); //1 2   
    // 代码2：嵌套数组不完全解构   
        let [a, [b], c] = [1, [2, 3], 4];   
        console.log(a, b, c); //1 2 4   
    // 代码3：跳过元素   
      let [i, , j] = [1, 2, 3];   
       console.log(i, j); //1 3   
</script> 